What does Annika mean?
A Scandinavian (and Dutch) diminutive of Anna, ultimately from Hebrew 'Channah' (Hannah) meaning grace or favour.
What does Dahlia mean?
IS a bloom word, but the flower is named after a person: the dahlia was named for 18th-century Swedish botanist Anders Dahl (whose surname means 'valley'). So the name means 'dahlia flower' through the flower, not through a floral root word.